Tuesday''s Ask the Experts question from a cleaning professional on the International Custodial Advisors Network (ICAN) "Ask the Experts" page: One of the buildings that we clean has marble walls. These walls have a yellow stain on them. I cannot positively identify the stain. It resembles smoke stains from tobacco smoke or residue from sulfur water, but I cannot be sure. What do you recommend for removing these stains?
Go to www.marble-institute.com/consumerresources/care.cfm and look down the list of possible staining sources. You may need to try several poultices to see if any are effective. Choose a small spot and do an experiment. If that is successful, you can proceed to larger sections. You will need time and... — Lynn E. Krafft, ICAN/ATEX editor
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